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Phys. Rev. Lett. 96, 016406 (2006) [4 pages]

Excitons in Carbon Nanotubes with Broken Time-Reversal Symmetry

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S. Zaric1, G. N. Ostojic1, J. Shaver1, J. Kono1,*, O. Portugall2, P. H. Frings2, G. L. J. A. Rikken2, M. Furis3, S. A. Crooker3, X. Wei4, V. C. Moore5, R. H. Hauge5, and R. E. Smalley5
1Department of Electrical and Computer Engineering, Rice University, Houston, Texas 77005, USA
2Laboratoire National des Champs Magnétiques Pulsés, 31432 Toulouse Cedex 04, France
3National High Magnetic Field Laboratory, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
4National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, USA
5Department of Chemistry, Rice University, Houston, Texas 77005, USA

Received 15 September 2005; published 11 January 2006

Near-infrared magneto-optical spectroscopy of single-walled carbon nanotubes reveals two absorption peaks with an equal strength at high magnetic fields (>55  T). We show that the peak separation is determined by the Aharonov-Bohm phase due to the tube-threading magnetic flux, which breaks the time-reversal symmetry and lifts the valley degeneracy. This field-induced symmetry breaking thus overcomes the Coulomb-induced intervalley mixing which is predicted to make the lowest exciton state optically inactive (or dark).

© 2006 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.96.016406
DOI:
10.1103/PhysRevLett.96.016406
PACS:
71.35.Ji, 78.67.Ch

*To whom all correspondence should be addressed.

Electronic address: kono@rice.edu.

 
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